image_filename = '../pygame.png'
import pygame
from pygame.locals import *
from sys import exit
pygame.init()
screen = pygame.display.set_mode((400,300), 0, 32)
pygame.display.set_caption("Moving Image")
img = pygame.image.load(image_filename)
x = 0
while True:
   screen.fill((255,255,255))
   for event in pygame.event.get():
      if event.type == QUIT:
         exit()
   screen.blit(img, (x, 100))
   x= x+0.05

   if x > 400:
      x = x-400
   pygame.display.update()